Mail Merge
Merge a CSV of recipients into a message template.
Mail Merge fills a message template with values from a CSV, one message per row. Placeholders in double braces are replaced from the columns, rows with missing values are flagged, and you can step through every merged message before using it. Nothing is sent and nothing is uploaded — it produces text.
Loading Mail Merge…
Runs entirely on your device. No file or text you enter here is uploaded. How to verify it.
How to use Mail Merge
- Add a CSV of recipients and check the columns it found.
- Write your template using {{column}} placeholders.
- Step through the previews, then copy or export the merged messages.
Questions about Mail Merge
Does this send the emails?
No, and it deliberately cannot. It produces the merged text: copy each message, download them all as files, or generate mailto links that open your own mail client with the message filled in. Sending needs a mail server, which would mean your recipient list leaving your device.
What happens to a row with a blank value?
It is flagged and you can jump straight to the flagged rows. A merge that silently produces “Dear ,” is worse than one that stops to tell you, and blank cells in the middle of a recipient list are extremely common.
How many recipients can it handle?
Thousands without difficulty, since it is text substitution over rows held in the tab. The practical limit is what you intend to do with the result — a mailto link per recipient stops being sensible well before the merge does.
Is my recipient list uploaded?
No. A recipient list is personal data about other people, often covered by the GDPR or the LGPD, and handing it to a free web tool is a genuine risk. Here the CSV is read on your device and never sent, so there is no copy to leak.
Can I use it for letters rather than emails?
Yes. The template is plain text, so it works equally well for letters, certificates, reminders or any repeated document. Export the merged messages as separate files and print or paste them from there.
Is Mail Merge really free, with no limits?
Yes. There is no account, no daily cap, no file-size tier and no watermark, because there is no server cost to recover. The site is funded by clearly disclosed partner recommendations on the Partners page, never by metering the tools.
Are my files or text uploaded when I use Mail Merge?
No. Everything is processed by JavaScript running in your browser, on your device. You can verify it: open your browser's developer tools, switch to the Network tab, and use the tool. You will see no request carrying your data — because there is nowhere for it to go.